The 16-years-and-running Midtown breakfast joint Cornerstone Restaurant (2330 J Street) lost its lease and will close in the next month. That is, unless loyal patrons’ outcry persuades property owners to reconsider. I don’t eat at Cornerstone, but I do give the place props for being one of the few joints to grab breakfast on Christmas—and I wouldn’t mind breakfast sticking around for a Noel to come.